Exclude process-specific link & result cache references from serialized Memcached_Data_Object instances. Should fix seemingly-random bugs due to destructor free()ing local resources by mistake.
Exclude process-specific link & result cache references from serialized Memcached_Data_Object instances.
Should fix seemingly-random bugs due to destructor free()ing local resources by mistake.

cherry-pick from 0.9.x

charnimda/lgbtpzn-social,csarven/statusnet,shashi/StatusNet,charlycoste/StatusNet,charlycoste/StatusNet,znarf/statusnet-ladistribution,sikevux/bsk-social,chimo/social,furtherfield/gnu-social,csarven/statusnet,studio666/gnu-social,zcopley/StatusNet,Piratas/tortuga,xebia/statusnet-oauth2,foocorp/gnu-social,shashi/StatusNet,zcopley/zcopleys-statusnet-clone,zcopley/zcopleys-statusnet-clone,studio666/gnu-social,sikevux/bsk-social,zh/statusnet,zh/statusnet,charnimda/lgbtpzn-social,chimo/social,zcopley/StatusNet,furtherfield/gnu-social,Piratas/tortuga,chimo/social,gnusocial/mainline,studio666/gnu-social,bankonme/gnu-social,gnusocial/mainline,furtherfield/gnu-social,minmb/statusnet,charnimda/lgbtpzn-social,d3vgru/StatusNet,furtherfield/gnu-social,csarven/statusnet,shashi/StatusNet,brion/StatusNet,d3vgru/StatusNet,brion/StatusNet,bankonme/gnu-social,faulteh/gnu-social,xebia/statusnet-oauth2,UngPirat/freesocial,zh/statusnet,zcopley/StatusNet,eXcomm/gnu-social,eXcomm/gnu-social,d3vgru/StatusNet,Piratas/tortuga,foocorp/gnu-social,minmb/statusnet,csarven/statusnet,xebia/statusnet-oauth2,UngPirat/freesocial,gnusocial/mainline,minmb/statusnet,zcopley/zcopleys-statusnet-clone,UngPirat/freesocial,faulteh/gnu-social,brion/StatusNet,charlycoste/StatusNet,eXcomm/gnu-social,znarf/statusnet-ladistribution,eXcomm/gnu-social,studio666/gnu-social,faulteh/gnu-social,bankonme/gnu-social,bankonme/gnu-social,znarf/statusnet-ladistribution,Piratas/tortuga,faulteh/gnu-social,sikevux/bsk-social,foocorp/gnu-social,gnusocial/mainline,sikevux/bsk-social